Opal from Andean tin province, South America
Bolivia | |
| [Opal-A var. Opal-AN] Ahlfeld, F. & Muñoz-Reyes, J. (1955) Las Especies Minerales de Bolivia |
| USGS Bulletin # 1975, p. 269. |
| Federico Ahlfeld and Alejandro Schneider-Scherbina (1964) Los Yacimientos Minerales y de Hidrocarburos de Bolivia, Boletín No. 5 (Especial), page 170 (Ministerio de Minas y Petroleo, La Paz) |
Wilson, Wendell E. (2001) Notes From the Editors - Old Yuma mine. The Mineralogical Record, 32 (6) 426-501 | |
Ahlfeld, F. & Schneider-Scherbina, A. (1964) Los Yacimientos Minerales y de Hidrocarburos de Bolivia. | |
| Petrov, Alfredo, Hyrsl, Jaroslav (2006) Famous mineral localities: Llallagua, Bolivia. The Mineralogical Record, 37 (2) 117-162 |
| Geology and Mineral Resources of the Altiplano and Cordillera Occidental, Bolivia (USGS Bulletin no. 1975) |
Huanuni mine, Huanuni, Pantaleón Dalence Province, Oruro, Bolivia